diff options
Diffstat (limited to 'sky/compact.cpp')
| -rw-r--r-- | sky/compact.cpp | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/sky/compact.cpp b/sky/compact.cpp index d73616d893..f88e71b149 100644 --- a/sky/compact.cpp +++ b/sky/compact.cpp @@ -50,6 +50,9 @@ namespace SkyCompact { +/** + * Returns the n'th mega set specified by \a megaSet from Compact \a cpt. + */ MegaSet *getMegaSet(Compact *cpt, uint16 megaSet) { switch (megaSet) { case 0: @@ -65,6 +68,19 @@ MegaSet *getMegaSet(Compact *cpt, uint16 megaSet) { } } +/** + \brief Returns the turn table for direction \a dir + from Compact \a cpt in \a megaSet. + + Functionally equivalent to: + \verbatim + clear eax + mov al,20 + mul (cpt[esi]).c_dir + add ax,(cpt[esi]).c_mega_set + lea eax,(cpt[esi+eax]).c_turn_table_up + \endverbatim +*/ uint16 **getTurnTable(Compact *cpt, uint16 megaSet, uint16 dir) { MegaSet *m = getMegaSet(cpt, megaSet); switch (dir) { @@ -83,6 +99,21 @@ uint16 **getTurnTable(Compact *cpt, uint16 megaSet, uint16 dir) { } } +/** + * \brief Returns the script for \a mode from Compact \a cpt. + * Add 2 to \a mode to get the offset. + * + \verbatim + uint16 *scriptNo = SkyCompact::getSub(_compact, mode); + uint16 *offset = SkyCompact::getSub(_compact, mode + 2); + uint32 script = (*offset << 16) | *scriptNo; + \endverbatim + * Is functionally equivalent to: + \verbatim + mov eax,c_base_sub[ebx+esi] + \endverbatim + where \a esi is the compact and ebx the mode. + */ uint16 *getSub(Compact *cpt, uint16 mode) { switch (mode) { case 0: @@ -189,6 +220,10 @@ static const uint32 turnTableOffsets[] = { MK32_A5(TurnTable, turnTableTalk), }; +/** + * Returns a void pointer to offset \a off in compact \a cpt + * as it would be on a 386. + */ void *getCompactElem(Compact *cpt, uint32 off) { if (off < COMPACT_SIZE) return((uint8 *)cpt + compactOffsets[off]); |